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Reply to topic   Topic: Apache load balancing using md_jk on 2 Tomcats BO4.2 fails
Author
pshar



Joined: 30 Jun 2020
Posts: 2
Location: India

PostPosted: Wed 01 Jul '20 15:40    Post subject: Apache load balancing using md_jk on 2 Tomcats BO4.2 fails Reply with quote

Tomcat (version 8.5.51) is installed on Server 1 and server 2, Apache (httpd-2.4.25-x86-vc14-r1) is on Server1
Worker 1 is configured to Server 1 and Worker 2 to Sever 2.
We have followed the following SAP notes
1676146 - How to configure Apache as a Reverse Proxy with BI 4.0?
2699221 - Session expiry and RWS 00008 error while accessing Fiori BILaunchpad through loadbalancer
https://blogs.sap.com/2015/04/01/wacs-load-balancing-for-restful-web-services/
Issue:
Tomcat off on server 1 redirects users to server 2
Tomcat off on server 2 redirects users to server 1
Switched on both Tomcat on server 1 and server 2 requires user to refresh url twice in order to logon
Test Apache via https://<servername> / works
Switched off Tomcat on server1 redirects user to server 2 therefore load balancing is working
Any help resolving this issue would be appreciated
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James Blond
Moderator


Joined: 19 Jan 2006
Posts: 6799
Location: Germany, Next to Hamburg

PostPosted: Thu 02 Jul '20 9:14    Post subject: Reply with quote

What is missing in that example is stickysession=JSESSIONID and ProxyPassReverse

e.g.

Code:

ProxyPass /examples balancer://mycluster stickysession=JSESSIONID
ProxyPassReverse /examples balancer://mycluster stickysession=JSESSIONID


Also I would use AJP instead of http (load mod_proxy_ajp) when there is Tomcat. I don't know that software, but in general Tomcat support ajp

Code:

ProxyRequests Off
ProxyPass /examples balancer://mycluster stickysession=JSESSIONID
ProxyPassReverse /examples balancer://mycluster stickysession=JSESSIONID

<Proxy balancer://mycluster>
   BalancerMember ajp://192.168.100.1:8090/examples route=server1
   BalancerMember ajp://192.168.100.2:8090/examples route=server2
</Proxy>
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pshar



Joined: 30 Jun 2020
Posts: 2
Location: India

PostPosted: Thu 02 Jul '20 10:48    Post subject: Reply with quote

Thanks alot for reply,

Our current config (httpd.conf) file as below

Admin note: config moved to https://apaste.info/hsbI please see the forum rules.


Please advise what needs to be updated , commenting Proxypass and Proxypassreverse is giving internal server error in restful application
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James Blond
Moderator


Joined: 19 Jan 2006
Posts: 6799
Location: Germany, Next to Hamburg

PostPosted: Thu 02 Jul '20 21:23    Post subject: Reply with quote

You can not use mod_jk (JkMount) and mod_proxy_* at the same time to the same resource. At least I'm not sure if that is overlapping, since I don't know the application.

What is in your error log about this? Did you try the sticky session with your http:// instead of the ajp:// ?
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